Rotary pump unit



July 28, 1942. J. F. JAWOROWSKI ROTARY PUMP UNIT Filed April 1, 1959 3 Sheets-Sheet 2 INVENTOR. 5055 -r' .mwaR0ws/ ATTO YE Y.

y 1942. J. F. JAWOROWSKI I ROTARY PUMP UN I T Filed April 1, 1939 a sheets-Sheet 5 INVENTOR.

J05 EPH F" JHWU R0w5K/ BY Q Patented July 28, 1942 ROTARY PUMP UNIT Joseph F. J aworowski, Allegan, Mich.,-assignor f one-fourth to Arthur H. Dettelbach and onefourth to Sam W. Emerson, bOth'Of Cleveland,

Ohio

Application April 1, 1939, Serial No. 265,495

2 Claims.

This invention relates in general to improvements in rotary engines and more particularly to unitary pumping units for gasoline and similar fluid dispensing devices. Presently used pumping units designed for such purposeincludea rotary pump for rotation in one direction only, means for filtering the pumped fluid, and check and by-pass valves for safeguarding operation of the unit. As such'units can be driven only by properly rotating driving means, that is, a unit with a clockwise rotating pump can be driven only by a clockwise rotating motor and a unit with an anti-clockwise rotating pump can be driven only by an anti-clockwise. rotating motor. It is therefore necessary to build units with clockwise and anti-clockwise rotating pumps and to carry repair stock for both types of units, which materially increases manufacturing and service costs.

The general object of the present invention is.

the provision of a unitary pumpingunit embodying -a reversible pump, filter and valve means, and means for effectingproper flow of pumped liquid through the filter and valve means when the pump is rotated clockwise and/or anti-clockwise.

Another object of the present invention is the provision of a unitary pumping unit embodying a chambered bracket, having arranged therein a filter, valved passages with check and by-pass valves, and a reversible pump and pump housing adapted to be mounted on saidbracket in either of two individual positions for alignment of the filter and valved passages of the bracket with the pump inlet and/or outlet when the pump rotates clockwise and/or anti-clockwise.

With these and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claims; and a preferred form of embodiment of the invention is hereinaftershown with reference to the drawings accompanying and forming a part of this specification.

In the drawings:

Fig. 1 is a side View of a pumping unit according to the invention.

Fig. 2 is a cross sectional view through the pumping. unit shown in Fig. 1, the section being,

taken on line 22 of Fig. 1.

Fig. 3 is a longitudinal sectional viewthroll the supporting bracket and pump, the section being taken on line 3-3 ofFig. 4.

Fig.4 .is a crosssectional View on line 4-4 of Fig. 3, showingv a cross section through the pump and bracket.

Fig. 5 is a longitudinal sectional view on line 55 of Fig. 2, showing the check valve arrangement and the eccentric relation of the pump blades and pump .rotor.

Fig. 6 ,is a perspective View of one of the reversible piston blades of one group of the blades used in the pump.

Fig. 7 is a perspective view of one of the reversible piston bladesof the other group of the blades used in the, pump.

Fig. 8 is a perspective view of the rotor without the blades.

Fig. 9 is a perspective view ofthe pump sleeve; and

Fig.. 10 is a side view, partly in section, of the drive shaft of the pump.

Referring now more specifically to; the drawings in which like reference characters designate like parts throughout the, several views, the pump unit comprises a motor bracket and frame structure 2 which mounts at one side a motor 3 and at its opposite side a pump structure 4. This bracket or frame structure, preferably a metal casting, hasupwardl'y. extended therefrom threehollow arms 5, each of which has. a threaded bore 6 in its face .1. These arms mount motor 3 and are secured to said motor by set screws 3 threadedly.

engaged in bores 6; In addition, bracketz is provided at its opposite sides with laterally. extending perforated flanges 9,, 9, the perforations ii] of which, permit of said bracket being readily attached and secured t0 a frame structure, not shown. Bracket 2 is provided with a threaded inlet ll adapted to be connected with a feed pipe (not shown), and this inlet communicates with a chamber I2 through a valve passage I4, having arranged therein a gravity actuated checkvalve l5, which valve controls communication between inlet II and chamber I2, and prevents escape of liquid sucked into chamber l2 during pumping operations. Chamber [2 is in open communication with a filter chamber l8, having mounted therein a cylindrical filter or strainer I! with two filteringscreens, a coarsely meshed.v

screen l8 and a finely. meshed screeni9, and furthermore in open communication with a bypass valve chamber 20, having arranged therein.

a by-pass valve 21. This by-pass valve, which controls communication of chamber I2 with an outlet chamber22, consists of a shiftable valve 23, yieldingly forced into contact with its valve seat 24 by a compression spring 25,the tension .of which is adjustable by means of a shiftable nut been opened up, is provided with a threaded outlet 39 and a flanged opening 3|, and the filter chamber l6 openly communicates with an inletchamber 32 arranged symmetrically with respect to chamber 22 and provided with a flanged opening 33, which latter opening is similar to opening 3| and symmetrically arranged with respect thereto. An elongated, flanged pump housing 34 is mounted on bracket 2 in such a fashion that its inlet and outlet passages 33 and 39 align with openings 33 and 3|. This housing has its perforated flanges 35, 35 secured to the perforated flanges 36, 35', which latter flanges surround openings 33, 3|, set screws 31 being used for this purpose. Pump housing 34 is so formed that its passages 38 and 39 can readily be aligned with either of the openings 33 and 3|, and mounting of housing 34 on bracket 2 in proper position is effected by a dowel pin 40 in pump housing 34, which pin can readily be aligned with and inserted into either of two dowel pin holes 4| and 42 in bracket 2, which pin holes insure alignment of passages 33 and 39 with either of the openings 33 and 3|. of the housing 34 being properly aligned with respect to inlet and outlet chambers 32, 22 or vice versa, as the case may be, for clockwise and/or anti-clockwise rotation of a rotary pump 43 mounted in pump housing 34.

Rotary pump 43 embodies a cylindrical sleeve 44 with an eccentric chamber 45, which chamber has a plurality of slots 46 effecting open communication of said chamber with passages 38, 39. This sleeve is keyed to housing 34 by means of a key 49, engaging a slot 56 in sleeve 44 arranged symmetrically to a line through the center of the outer and inner Walls of said sleeve and a slot 5| in housing 34, and forms a cylindrical working chamber 52 eccentrically arranged in housing 34. Working chamber 52 has eccentrically mounted therein a slotted and chambered, integral rotor member 53, which member rotates concentrically in housing 34 and has its hub portions 54 and 55 rotatably mounted in axially aligned bearings 56 and 51. Bearing 56 and 51 are eccentrically arranged with respect to working chamber 52 and are mounted in a top cap 58 and a bottom cap 59 secured to the opposite sides of pump housing 34 by means of set screws 66, 6| respectively. Bottom cap 59 mounts in its bored hub portion 62 a stationary shaft 63 concentrically arranged in working chamber 52, which shaft is pinned to bottom cap 59 by means of a pin 64. This shaft is provided at its other end with an eccentric extension 65, mounting a pilot bushing 66 which bushing supports hub 54 of rotor member 53 and eliminates undesired vibration of shaft 63.

The slotted integral rotor member 53, which, as stated above, has its hub portions 54, 55 rotatably mounted in bearings 56, 51 respectively, engages at 61 the inner face of working chamber 52 and forms with said working chamber a crescent- The described arrangement permits shaped chamber 63, subdivided by four piston 7 blades 69, slidably engaging the parallel side walls 16 of slots 1| in the wall 12 of rotor member 53. These piston blades each embody two hookshaped bearing portions 13 which rotatably en gage with the surface of a tubular bearing mem-' ber 14, sleeved upon shaft 63 and therefore con centrically arranged in working chamber 52. The end faces 15 of rotor member 53 slidab1y contact with the side faces of bearings 56, 51 and are properly sealed when top and bottom caps are securely fastened to housing 34, as previously described.

,A bore 16 in the central portion of top cap 58 permits of a drive shaft 11 being extended into a chamber 18 in said cap member. This drive shaft has its inner end enlarged and externally chamfered as at 19 to provide a male coupling member 89 extended into a chamfered bore 6| in the hub portion 54' of rotor 53, so as to effect direct coupling between drive shaft 11 and rotor 53. Male coupling member 86, in addition, is provided with a bore 82 mounting a ball 83, transferring all axial stresses on drive shaft 11 to stationary shaft 63.

The drive shaft 11 which, as previously deg scribed, extends outwardly from chamber 18 through bore 16 carries a shiftable seal cup 84 co-operating with a seal bushing 85. This seal bushing which includes a hexagonally shaped sealing extension 86 is snugly fitted in bore 16 and contacts with its extension with seal cup 84, so as to effect a fluid-tight seal of bore 16 in top cap 58, through which bore drive shaft 11 extends. A compression spring 81, seated against male coupling member and a washer 538.comp-ressing a packing 89 in seal cup 84, effects proper contact of seal cup 84-and seal bushing and also forces ball 83 in coupling member 80, into yielding contact with stationary shaft 63. In addition, there is provided in chamber 18 a compression spring 96 which insures yielding contact of bearings 56, 51 with end faces 15 of rotor member 53 and automatically takes up any wear on said bearings and end faces.

The hook-shaped form of the bearing portions 13 on piston blades 69 permits of these portions being readily inserted into slots 1| of rotor 53 by a mere tilting action. There are tWo bearing portions on each blade, which portions are arranged so that the blades can readily be used in opposed positions and permit of a rotor with four blades being assembled from two sets of blades. The blades each include a wing portion 9| exlgending over the entire length of working cham-' er 52. is rotated in anti-clockwise direction by motor 3, having its shaft 92 coupled with drive shaft 11 by means of a coupling member 93, fluid is drawn from a storage tank (not shown) into inlet H and through checkvalve l5 into and through chamber l2, filter or strainer |1, filter chamber 16, chamber 32, opening 33 into passage 36 of pump housing 34. Through this passage the fluid is fed through slots 46 in sleeve- 44 to and through the pump structure 43', discharged through other slots 46 in sleeve 44 into and through passage 39, chamber 22 and finally through outlet opening 35 -to a meter (not shown) from where such fluid is dispensed as customary through a valved discharge hose (also not shown). Whenever the .fluid is freely discharged through outlet opening 30 and a discharge hose, then by-pass valve 2| stays fully closed and cuts off any re-circulation of pumped fluid. However, when discharge of the pumped When the thus constructed pump unit fluid is restrained, then by-pass valve 2| opens and permits of the pumped fluid being recirculated through the pump by feeding the fluid through by-pass valve 2|, chamber I2, filter chamber l6, chamber 32, passage 38 into and through pump structure 43 and back into chamber 22 and so on. The by-pass valve being set to the desired pressure permits of any surplus of pumped fluid being recirculated through strainer I1 and pump structure 43. In this case check valve is fully closed and therefore prohibits feed back of fluid into the tank and also prohibits withdrawal of excessive liquid from such tank, so that the volume of withdrawn fluid equals the volume of discharged fluid. By-pass valve 2| automatically prevents excessive loads on the pump structure and check valve I5, that insures a liquid column in the feed line to chamber |2 at all times.

In case the pump is to be driven by a motor rotating in clockwise direction, then the pump and its housing is dismantled from bracket 2 and the housing is turned 180, so that dowel pin 40 alignswith and enters pin holes 42. When pump 43 and its housing are now re-assembled and properly secured to bracket 2, the pumped liquid will be drawn from chamber 32 into passage 38 and, after passing through the pump, will be discharged through passage 39, chamber 22 and outlet opening 30 to a meter. Filter l1 and check and by-pass valves I5 and 2| are thus properly related to each other in either of the two positions of the pump housing and permit of the pump unit being used with clockwise and anti-clockwise driving means. The operation of the pump unit in both positions of the pump housing is identical for clockwise and anticlockwise rotation of the pump and therefore does not need to be described again.

Having thus described my invention, what I claim is:

l. A rotary pump unit comprising a chambered bracket having inlet and outlet passages and provided at one side with symmetrically arranged, offset ports in open cormnunication with said passages, a symmetrically constructed pump with two symmetrically arranged, 180 oiT- set chambers removably attached to said bracket opposite said ports so that the chambers of said pump are aligned with said ports and communicate with said passages, and a motor mounted on the other side of said bracket in axial alignment with said pump and directly coupled therewith, said pump including an elongated symmetrically constructed housing, a sleeve member with a plurality of slots non-rotatably secured within said housing so as to subdivide same into two symmetrically arranged chambers, said sleeve member having its inner cylindrical chamber eccentrically arranged with respect to the axis of the body of said sleeve member, and said cylindrical chamber being in open communication with said two chambers through the slots in said sleeve member, a blade carrying rotor with elongated slots arranged in said cylindrical chamber in axial alignment with the body of said sleeve member and dimensioned for eccentric rotation in said cylindrical chamber and tangential contact with its wall, and blades slidably arranged in the slots of said rotor and dimensioned and mounted for concentric rotation in said cylindrical chamber and contact with its Wall said pump being symmetrically constructed and its rotor aligned with the axis of the body of said sleeve member to permit axial rotation of said symmetrically constructed housing 180 with respect to said bracket and efiect proper relation of said pump with respect to the inlet and outlet passages of said bracket for clockwise and anticlockwise rotation of said rotor.

2. A rotary pump unit as described in claim 1, embodying a check valve in said inlet passage near its inlet opening, a by-pass passage connecting said outlet passage with said inlet passage, and a pressure actuated by-pass valve in said by-pass passage.

JOSEPH F. JAWOROWSKI. 

